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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The source selection operation supplies pressure for these
different brake modes:
* Normal brakes
* Alternate brakes
* Accumulator brakes
* Gear retract braking.
When the pressure in one hydraulic brake source decreases,
the alternate brake selector valve changes position to set the
next available source. This pressure goes to the normal or
alternate brake metering valves. The accumulator isolation
valve closes to hold pressure in the brake accumulator during
alternate brake operation. The accumulator isolation valve
opens to send accumulator pressure to the normal brake
metering valves when hydraulic system A and B do not supply
pressure.
Brake pedal input goes through the brake pedal bus
mechanism and cables to the left and right brake metering
valves. The metering valves use this mechanical input to
control the pressure source and pressurize the brakes.
Normal Brakes
When hydraulic system B supplies pressure, the alternate
brake selector valve moves to stop pressure to the alternate
brake system. The brakes then get metered hydraulic system B
pressure from the normal brake metering valves.
Hydraulic system B pressure also charges the brake
accumulator and moves the accumulator isolation valve.
Alternate Brakes
When hydraulic system B pressure does not supply pressure,
hydraulic system A pressure moves the alternate brake
selector valve. The alternate brake selector valve sends
hydraulic system A pressure to the alternate brake system.
The brakes can then get metered hydraulic system A pressure
from the alternate brake metering valves.
Pressure in the alternate brake system moves the accumulator
isolation valve to isolate accumulator pressure.
Accumulator Brakes
When neither hydraulic system A nor B supplies pressure,
accumulator pressure moves the accumulator isolation valve.
The brakes then get brake accumulator pressure from the
normal brake metering valves.
The brake system relief valve starts to open at 3500 psi to
protect the accumulator when the accumulator pressure
increases to more than normal.
HYDRAULIC BRAKE SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Page 27
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-41-00-013
Gear Retract Braking
When the normal brake system receives pressure during
landing gear retraction, the alternate brake selector valve
sends landing gear retract pressure to the alternate brake
system. The gear retract pressure operates the alternate brake
metering valves to the brakes applied position. This stops
wheel spin before they go into the wheel well.
HYDRAULIC BRAKE SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Page 28
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-41-00-013
HYDRAULIC BRAKE SYSTEM - FUNCTIONAL DESCRIPTION
HYDRAULIC BRAKE SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Page 29
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-41-00-013
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The antiskid system controls the brake system to prevent wheel
skids during brake application.
The autobrake system supplies metered brake pressure to stop
the airplane after the airplane lands or if a rejected takeoff
(RTO) occurs.
Antiskid System
The antiskid system monitors wheel deceleration and controls
the brake metered pressure to prevent skid conditions. These
are the antiskid functions:
* Skid control operates at more than eight knots to control
each wheel deceleration during normal antiskid and both
wheels on each main landing gear during alternate antiskid
* Locked wheel protection compares wheel speeds more than
25 knots of the two inboard or the two outboard wheels and
releases brake pressure from the slower wheel
* Touchdown protection prevents wheel brake operation of 2
and 4 when the airplane is in the air
　
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